m50 with m20 fly help

Post Sun Oct 30, 2011 11:57 am

tried looking on the wiki...

i've fitted a m50 with a m20 flywheel and used a 318 is e30 box.

seems i can't turn the engine over with no plugs in..

i', sure i read that with the combo i have i have to either lighten the fly wheel or cut down some bolts to stop them hitting the back of the fly wheel..

can anyone tell me which bolts these are please?

Post Sun Oct 30, 2011 12:51 pm

as you bolt the flywheel on youll see it.

at the join between the sump and the block there are some long bolts and a bit of the sump that needs removing.

im sure someone will be along with a photo

Post Sun Oct 30, 2011 6:09 pm

Lighten the flywheel, 2 birds one stone and all that

Post Sun Oct 30, 2011 9:20 pm

e30-dk grinded some off his sump for clearance I think. But whilst it's off you might as well get it lightened, it's another cool thing to say you've done

Post Mon Oct 31, 2011 9:05 am

can the box be pulled off the back once the engines been fitted?

twat me fitted the engine and box then found out it doesn't turn over... i know i knob!!!

Post Mon Oct 31, 2011 3:40 pm

I've done it, but its a fairly large ball ache, that was with two of us on a 4 post ramp. You'll need to drop the subframe an inch or two for clearance, and the starter needs to come off again, I would definitely consider just taking the lot out if I was doing it again.

It will either be catching on the block where the long rear sump bolts come home, or the bolts that hold the flywheel onto the crank will be too long.

Post Mon Oct 31, 2011 4:48 pm

when looking up from the underside its the 2 bolts located up behind the flywheel...these look to be on contact with the flywheel... out it comes then!

Post Mon Oct 31, 2011 4:50 pm

Suggest you take the advice offered here - while it's out get the flywheel lightened (local engineering shop should do it for about £20). Solves the sump problem and spins the engine up quicker. Worth doing (i've done this on my M52 conversion)

Post Mon Oct 31, 2011 5:23 pm

yeah i will do.. had a lightened flywheel before but hate it, due to being on a smaller engine. removed about 2 kg... hated it having no power up hill...

what have you had removed from yours?

Post Mon Oct 31, 2011 5:41 pm

lee wrote:when looking up from the underside its the 2 bolts located up behind the flywheel...these look to be on contact with the flywheel... out it comes then!

Mine was on an M50 block so it might be different but it was the raised bit on the back side of the block they screwed into that caught rather than the bolts themselves, I just ground a few mm off.

Post Mon Oct 31, 2011 5:53 pm

lee wrote:yeah i will do.. had a lightened flywheel before but hate it, due to being on a smaller engine. removed about 2 kg... hated it having no power up hill...

what have you had removed from yours?

Not sure why it would have caused you issues going uphill, but as it was on a different engine I wouldn't expect it to be the same.

I'm not sure how much was removed (stupidly didn't weigh it before installing it into the car), but I had it taken down to the obvious/natural step on the engine side as advised by others on here. Removes a decent amount, but doesn't exactly make it featherweight!

Post Mon Oct 31, 2011 7:21 pm

No power going uphill

Post Wed Nov 16, 2011 12:20 pm

maf260- up hill performance is affected as removing weight from the flywheel means less torque..

less stored energy so to speak.